The XSetClipRectangles function
changes the clip-mask in the specified GC to the specified list of rectangles
and sets the clip origin. The output is clipped to remain contained within
the rectangles. The clip-origin is interpreted relative to the origin of
whatever destination drawable is specified in a graphics request. The
rectangle coordinates are interpreted relative to the clip-origin. The
rectangles should be nonintersecting, or the graphics results will be undefined.
Note that the list of rectangles can be empty, which effectively disables
output. This is the opposite of passing None as the clip-mask in XCreateGC,
XChangeGC, and XSetClipMask.

If known by the client, ordering relations
on the rectangles can be specified with the ordering argument. This may
provide faster operation by the server. If an incorrect ordering is specified,
the X server may generate a BadMatch error, but it is not required to
do so. If no error is generated, the graphics results are undefined. Unsorted
means the rectangles are in arbitrary order. YSorted means that the
rectangles are nondecreasing in their Y origin. YXSorted additionally
constrains YSorted order in that all rectangles with an equal Y origin
are nondecreasing in their X origin. YXBanded additionally constrains
YXSorted by requiring that, for every possible Y scanline, all rectangles
that include that scanline have an identical Y origins and Y extents.

The server failed to allocate the requested resource or server memory.

BadGC

A value for a GContext argument does not name a defined GContext.

BadMatch

Some argument or pair of arguments has the correct type and
range but fails to match in some other way required by the request.

BadValue

Some numeric value falls outside the range of values accepted by the
request. Unless a specific range is specified for an argument, the full
range defined by the argument's type is accepted. Any argument defined as
a set of alternatives can generate this error.